INFO: task kworker/0:5:17752 blocked for more than 143 seconds. Not tainted 6.4.0-syzkaller-11811-gfe1de5516796 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:5 state:D stack:22984 pid:17752 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xaa9/0x2f00 kernel/sched/core.c:6710 schedule+0xde/0x1a0 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 unregister_netdev+0x12/0x30 net/core/dev.c:10923 usbnet_disconnect+0xe6/0x510 drivers/net/usb/usbnet.c:1621 usb_unbind_interface+0x1dc/0x8e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1270 [inline] device_release_driver_internal+0x443/0x610 drivers/base/dd.c:1293 bus_remove_device+0x22c/0x420 drivers/base/bus.c:574 device_del+0x399/0xa30 drivers/base/core.c:3814 usb_disable_device+0x360/0x7b0 drivers/usb/core/message.c:1420 usb_disconnect+0x2db/0x8a0 drivers/usb/core/hub.c:2253 hub_port_connect drivers/usb/core/hub.c:5261 [inline] hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] port_event drivers/usb/core/hub.c:5726 [inline] hub_event+0x2073/0x4ed0 drivers/usb/core/hub.c:5808 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 3 locks held by kworker/0:0/7: #0: ffff8881097d4138 ((wq_completion)ipv6_addrconf ){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] , at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] , at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] , at: set_work_data kernel/workqueue.c:675 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] , at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000007fdb0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88d898a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4630 1 lock held by rcu_tasks_kthre/12: #0: ffffffff87ca6070 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3} , at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/13: #0: ffffffff87ca5d70 ( rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff87ca6c80 ( rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615 1 lock held by dhcpcd/2410: 2 locks held by getty/2432: #0: ffff888114c10098 (&tty->ldisc_sem){++++}-{0:0} , at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000452f0 (&ldata->atomic_read_lock){+.+.}-{3:3} , at: n_tty_read+0xf08/0x13f0 drivers/tty/n_tty.c:2187 6 locks held by kworker/0:3/5267: 3 locks held by kworker/1:5/5368: #0: ffff8881097d4138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] , at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] , at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] , at: set_work_data kernel/workqueue.c:675 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] , at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc90001c9fdb0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work) ){+.+.}-{0:0}, at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88d898a8 (rtnl_mutex){+.+.}-{3:3} , at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4630 6 locks held by kworker/0:7/5471: #0: ffff88810ca54538 ((wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] ){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] ){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] ){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] ){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] ){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] ){+.+.}-{0:0}, at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc90001c17db0 ( (work_completion)(&hub->events)){+.+.}-{0:0} , at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffff8881057e6190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #2: ffff8881057e6190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5754 #3: ffff888105b29500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3162 [inline] #3: ffff888105b29500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5318 [inline] #3: ffff888105b29500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] #3: ffff888105b29500 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5726 [inline] #3: ffff888105b29500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x2847/0x4ed0 drivers/usb/core/hub.c:5808 #4: ffff88810fef7068 (hcd->address0_mutex){+.+.}-{3:3} , at: hub_port_connect drivers/usb/core/hub.c:5319 [inline] , at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] , at: port_event drivers/usb/core/hub.c:5726 [inline] , at: hub_event+0x287c/0x4ed0 drivers/usb/core/hub.c:5808 #5: ffffffff886c80d0 (ehci_cf_port_reset_rwsem){.+.+}-{3:3} , at: hub_port_reset+0x189/0x1de0 drivers/usb/core/hub.c:2977 6 locks held by kworker/0:8/9176: 6 locks held by kworker/0:5/17752: #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000e0f7db0 ((work_completion)(&hub->events)){+.+.}-{0:0} , at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffff888105f36190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5754 #3: ffff888132772190 (&dev->mutex ){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] ){....}-{3:3}, at: usb_disconnect+0xff/0x8a0 drivers/usb/core/hub.c:2244 #4: ffff88811e187160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #4: ffff88811e187160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1093 [inline] #4: ffff88811e187160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1290 #5: ffffffff88d898a8 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdev+0x12/0x30 net/core/dev.c:10923 6 locks held by kworker/1:0/17876: #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000e44fdb0 ( (work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffff888105f4e190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #2: ffff888105f4e190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5754 #3: ffff88810434c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1003 #4: ffff88811a035160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1003 #5: ffffffff88d898a8 (rtnl_mutex){+.+.}-{3:3}, at: register_netdev+0x15/0x50 net/core/dev.c:10177 6 locks held by kworker/0:1/23076: #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] #0: ffff88810ca54538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8fd/0x16f0 kernel/workqueue.c:2567 #1: ffffc90001707db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x930/0x16f0 kernel/workqueue.c:2571 #2: ffff888105bde190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5754 #3: ffff888105f31500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3162 [inline] #3: ffff888105f31500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5318 [inline] #3: ffff888105f31500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] #3: ffff888105f31500 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5726 [inline] #3: ffff888105f31500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x2847/0x4ed0 drivers/usb/core/hub.c:5808 #4: ffff8881023aa868 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5319 [inline] #4: ffff8881023aa868 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] #4: ffff8881023aa868 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5726 [inline] #4: ffff8881023aa868 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x287c/0x4ed0 drivers/usb/core/hub.c:5808 #5: ffffffff886c80d0 (ehci_cf_port_reset_rwsem){.+.+}-{3:3}, at: hub_port_reset+0x189/0x1de0 drivers/usb/core/hub.c:2977 4 locks held by udevd/28309: #0: ffff88813db13e80 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xe3/0x12d0 fs/seq_file.c:182 #1: ffff88811b7ec088 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4b/0x450 fs/kernfs/file.c:154 #2: fSeaBIOS (version 1.8.2-google)